[Swan-dev] speed of tests on three systems

D. Hugh Redelmeier hugh at mimosa.com
Sun Oct 21 15:12:32 UTC 2018

Last night I ran the tests on three different machines.  The tests may 
have been with slightly different versions of the tree, but all were fresh 
within the last day.

Each machine used KVM_WORKERS=2
Each machine is running Fedora 24 for x86-64, with recent updates.
Each machine was only running the test suite.

redtiny was running the test suite from the Gnome Desktop; redox and 
redbird ran it from an SSH session.  I don't imagine that matters.

redtiny: 5:46:40.231926 real time
Lenovo ThinkCentre M93p Tiny,
i5-4570T CPU @ 2.90GHz, 4 core,
16G RAM (two sticks)
laptop HDD 7200RPM

redox: 5:23:38.344347 real time
Lenovo ThinkCentre M93p Tiny,
i5-4570T CPU @ 2.90GHz, 4 core,
8G RAM (one stick)

redbird: 5:23:12.254131 real time
Dell Optiplex 990 (A24 firmware with spectre/meltdown slowdowns)
i5-2400 CPU @ 3.10GHz,  4 core,
12G RAM (two unmatched sticks)

All times seemed quite similar.  Each machine was distinct in a couple
of dimensions.  It is possible that differences cancelled out.  But it
seems more likely that the differences didn't affect the time very

It looks as if the following don't have severe effects on run time:

- RAM beyond 8G (with two workers)

- processor speed (but the processors were fairly close in speed)

The system with the HDD was only 7% slower (perhaps the disk speed
difference was counteracted by greater RAM).

These results don't tell us where all the time goes.

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